Is it possible for an app using NSPersistentCloudKitContainer to enable sync in the background, if so, how? Install app on your iPhone and iPad, create some data, it automatically syncs to both and life is good Close the iPad app Modify the data on iPhone Desired behavior: The backgrounded iPad app should sync (even if it takes a while) and be informed that its local database has finished syncing or similarly that changes were made. The use case is I want to reload my widget when data changes so it's up-to-date, so I need my app to sync it in the background, then notify when it's complete to be able to trigger the widget reload. I am concerned it will be a poor widget experience if it's always showing stale data until they manually open the app to initiate sync - kind of defeats the purpose of widgets. ha According to this post, they found sync is never run in the background. Is this not the case, or has it changed in iOS 15? Thanks!

Is there a way to find out how much of the app's budget is used up already?

I'm creating a pure SwiftUI app. I wish to use a background task to keep my data up-to-date while in the background. I've found the BGTaskScheduler documentation (https://developer.apple.com/documentation/backgroundtasks/bgtaskscheduler). In the section titled Register, Schedule, and Run Tasks, the document states: During app startup, you register a launch handler, a small block of code that runs the task, and an associated unique identifier for each task. Register all of the tasks before the end of the app launch sequence. For more information, see About the App Launch Sequence. I know you can do this in application(_ :, didFinishLaunchingWithOptions:) method of the AppDelegate. However, in a pure SwiftUI app there is no AppDelegate. So, how do I register my background task in SwiftUI? If I can't, then how do a retrofit an AppDelegate into an already existing SwiftUI app? Thanks, Alan

I regularly see questions, both here on DevForums and in my Day Job™ at DTS, that are caused by a fundamental misunderstanding of how background execution works on iOS. These come in many different variants, for example: How do I keep my app running continuously in the background? If I schedule a timer, how do I get it to fire when the screen is locked? How do I run code in the background every 15 minutes? How do I set up a network server that runs in the background? How can my app provide an IPC service to another one of my app while it’s in the background? The short answer to all of these is You can’t. iOS puts strict limits on background execution. Its default behaviour is to suspend your app shortly after the user has moved it to the background; this suspension prevents the process from running any code. There’s no general-purpose mechanism for: Running code continuously in the background Running code at some specific time in the background Running code periodically at a guaranteed interval Resuming in the background in response to a network or IPC request However, iOS does provide a wide range of special-purpose mechanisms for accomplishing specific user goals. For example: If you’re building a music player, use the audio background mode to continue playing after the user has moved your app to the background. If you’re building a timer app, use a local notification to notify the user when your timer has expired. If you’re building a video player app, use AVFoundation’s download support. Keep in mind that the above is just a short list of examples. There are many other special-purpose background execution mechanisms, so you should search the documentation for something appropriate to your needs. IMPORTANT Each of these mechanisms fulfils a specific purpose. Do not attempt to use them for some other purpose. Before using a background API, read clause 2.5.4 of the App Store Review Guidelines. Additionally, iOS provides some general-purpose mechanisms for background execution: To resume your app in the background in response to an event on your server, use a background notification (aka a ‘silent’ push). For more information, see Pushing Background Updates to Your App. To request a small amount of periodic background execution time to refresh your UI, use BGAppRefreshTaskRequest. To request extended background execution time, use BGProcessingTaskRequest. To prevent your app from being suspended for a short period of time so that you can complete some user task, use a UIApplication background task. For more information on this, see UIApplication Background Task Notes. To download or upload a large HTTP resource, use an NSURLSession background session. All of these mechanisms prevent you from abusing them to run arbitrary code in the background. As an example, consider the NSURLSession resume rate limiter. For more information about these limitations, and background execution in general, I strongly recommend that you watch WWDC 2020 Session 10063 Background execution demystified. It’s an excellent resource. Finally, if you have questions about background execution that aren’t covered by the resources listed here, please open a new thread on DevForums with the details. Tag it appropriately for the technology you’re using; if nothing specific springs to mind, use BackgroundTasks. Also, make sure to include details about the specific problem you’re trying to solve because, when it comes to background execution, the devil really is in the details. Share and Enjoy — Quinn “The Eskimo!” @ Developer Technical Support @ Apple let myEmail = "eskimo" + "1" + "@" + "apple.com" Change history: 22 Jul 2021 — First posted. 26 Jul 2021 — Extended the statement about what’s not possible to include “running code periodically at a guaranteed interval”. 12 Aug 2021 — Added more entries to the common questions list, this time related to networking and IPC. Made minor editorial changes.

I am working on an iOS app that uses push notifications to wake up the app so I can receive SIP calls when app is not in foreground. When all is working, app gets a VOIP push notification while in background which wakes up the app and within 5 seconds I get a SIP invite to process the call. We are using a timer for 5 seconds to wait for SIP after getting VOIP push. The issue I am having is after a certain period of running sip calls test, app stopped receiving SIP invites if it is in background. This happened on our multiple test devices. Restarting the app and rebooting the device didn’t help but uninstalling & installing the same version of app did the trick. What could be the reasons behind this and how can we fix this? Have anyone else experienced the similar thing? Any suggestions . TIA.

I have some business requirements to send data to a particular cloud location while the app is not running (not even in the background). I am looking for Apple support on whether there are any services in iOS SDK which allow me to do the same. This service should continue to upload data until it detects that there is no more data left to be uploaded.

Hi All, I have coded a TCP Server packaged inside C++ static library. I am using this static library within the iOS Swift UI application. I have coded a simple UI which has a button, on click of which I want to start the TCP server (which is written in C++ and inside the linked static library). After the TCP server is started, I want to push the application to background and then run the client application which is going to interact with this TCP server from the backgrounded SwiftUI application. I want the TCP server to be running even the application goes to the background mode as I have another user interface application which is going to interact with the TCP server on the same device. I tried using background task, but I don't know whether I am doing something wrong there, or I cannot achieve what I want using the BackgroundTask functionality available in iOS. The main thing here is, the TCP server code is in C++ inside static library and I want to start the TCP server from SwiftUI application layer. I have managed to call C++ function from Swift that part is available. Can anyone show me the right path here ? How do I keep the BSD Socket based TCP Server active while the application is in Background mode ?

I have implemented local database and based on some logics I need to scheduled background task and app refresh on every 4 hours. And on app refresh need to generate local notification to show some reminder information. I created POC and tested with apple xcode command and it generating notification e -l objc -- (void)[[BGTaskScheduler sharedScheduler] _simulateLaunchForTaskWithIdentifier:@"MyTaskIdentifier"] but on actual testing I am not getting local notification. Please let me know if any thing missed or is there any limitation with background schedule job?. (I read the background task scheduler has some complex algorithm to schedule it and system OS decide it to generate, but for me its was not generate single time) https://developer.apple.com/documentation/backgroundtasks/bgtaskscheduler Any help on this ? Thanks

Before asking, I referenced this thread (https://developer.apple.com/forums/thread/652592) While the Android devices can function fully as both Central and Peripheral while an app is in both foreground and background execution modes, iOS apps are bound by restrictions that iOS has on background Bluetooth functionality. When in the background, iOS apps advertise in a proprietary advertisement format that is not part of the Bluetooth standard and thus not readable by non-iOS devices, hence it is unable to scan for other devices in any meaningful way. Any work around to this problem?

Like WhatsApp, i want to insert my incoming message in local database when notification arrives in all states like terminated state also without click on notification. My FCM payload is { "message": { "token": "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX", "apns": { "headers": { "apns-priority": "10" }, "payload": { "aps": { "alert": { "title": "From Name", "subtitle": "Group Name", "body": "Message Text" }, "sound" : "default", "mutable-content" : 1 } } } } } i am able to receive notification in terminated state also, but i want to invoke my app's code when notification receives like whatsapp. i am using flutter, fcm.

I am unaware of how to get location data in the background/while the app is closed. I do know how to use when in use description, and when i try changing everything in my code and plist to "always in use" the app doesn't work with the location data.

I want to call api to update user location everytime(after every 1 min) when app is in background. I have enabled everything that is required for this but after 10-15 mins system kills my app. Is any solution to achieve this?

Application process being killed by iOS internal, when the application was background for more than 30 secs and application is consuming Bluetooth External Asseceries frameworks (data transmission or just Bluetooth connected, no data transmission) or periodic network upload is progress in background Not observed this issue in till iOS 15 beta 6. Observed in iOS 15 Beta 7 and 8 am I missing any new configuration to run the application in background other than External BLE Accessaries and Uses Bluetooth LE Accessories in Background ?

Currently developing a medical device app in React Native that needs to constantly run in the background to save data from the ble device. Is there a way to do this instead of using the background fetch that only runs periodically?